US3897147A - Lamphouse assembly for photographic printers and enlargers - Google Patents

Lamphouse assembly for photographic printers and enlargers Download PDF

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Publication number
US3897147A
US3897147A US453109A US45310974A US3897147A US 3897147 A US3897147 A US 3897147A US 453109 A US453109 A US 453109A US 45310974 A US45310974 A US 45310974A US 3897147 A US3897147 A US 3897147A
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assembly
mixing chamber
illuminating means
light
light sources
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Expired - Lifetime
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US453109A
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English (en)
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Murray H Simon
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Priority to US453109A priority Critical patent/US3897147A/en
Priority to JP3305975A priority patent/JPS5419342B2/ja
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means
    • G03B27/545—Lamp housings; Illuminating means for enlargers
    • G03B27/547—Lamp housings; Illuminating means for enlargers colour mixing heads

Definitions

  • Each trio' of lamps is mounted at the correct 3,011,388 12/1961 Baumbach et a1...., 355/35 X position relative to the mixing chamber by means of a Simmon X unitary bracket ecured to an inspection cover 3222985 12/1965 Remesm 355/37 plate facilitating access to each lamp assembly.
  • the invention relates generally to color photographic printing and enlarging equipment, and, more particularly, to a lamphouse with plural filtered lamps and a light mixing chamber.
  • US. Pat. No. 3,630,639 to Clapp represents an example of a lamphouse assembly employing a mixing chamber.
  • the mixing chamber has a completely reflective roof and the lamps are individually mounted such-that their optical axes are perpendicular to the path of light passing through the negative. Because of the high number of reflections which occur in the Clapp arrangement with premixing chambers and a primarily reflective main mixing cubicle, much of the original intensity of the light sources is sacrificed. The lower the intensity of the diffused light applied to the negative, the longer the exposure time.
  • the general purpose of the invention is to provide a compact, lightweight, low cost lamphouse assembly for color photographic printing and enlarging, which is adaptable to existing photographic enlargers.
  • a more specific object of the invention is to couple more of the direct intensity of a plural lamp arrangement to the negative area to shorten the exposure time.
  • Another object of the invention is to facilitate mounting and removal of plural lamp assemblies by utilizing an interconnected inspection cover and lamp mounting bracket arrangement.
  • Still another object of the invention is to provide a mixing chamber in which the roof portion is composed of joined translucent panels such that light is applied through the translucent panels to a final diffusing plate directly below the roof portion.
  • Each trio of lamps is mounted at the correct position by means of a unitary angled bracket secured to an inspection cover plate facilitating access to each lamp assembly.
  • the cover plate When the cover plate is removed, the corresponding three-lamp assembly is removed intact for inspection or replacement of individual lamps. Because of the special mounting bracket, merely replacing the cover plate automatically aligns the lamps.
  • the design of the lamphouse results in an extremely compact, lightweight and low-cost color head adaptable to existing black and white photographic enlargers.
  • the construction of the lamphouse is so compact and lightweight that separate controls for the individual lamps can be mounted directly on the lamphousing itself.
  • FIG. 1 is aperspective view of an embodiment of the lamphouse assembly according to the invention.
  • FIG. 2 is a sectional view showing the interior of the lamphouse assembly of FIG. 1;
  • FIG. 3 is a sectional view taken along lines 33 of FIG. 2;
  • FIG. 4 is a sectional view taken along lines 44 of FIG. 2.
  • FIGS. 1', 2 and 3 illustrate the overall configuration of the housing for the lamphouse assembly 10.
  • this assembly is designed to directly replace the lamphouse unit on any conventional photographic enlarger or printer, especially those formerly used exclusively for black and white work.
  • An elongated hexagonal enclosure 12 with a depending bottom portion 14 houses thecomponents of the lamphouse assembly. Besides providing'a light shield, the shape of the enclosure 12 is specifically designed to furnish mounting surfaces for the optical components of the lamphouse assembly.
  • a control module 16 attached to the outside of the enclosure 12 provides three variable voltage control knobs l8 and corresponding ON-OFF switches 20 for actuating pairs of red, green and blue light sources within the enclosure 12 and for individually controlling their relative intensity.
  • the two angled side portions of the enclosure 12 are symmetrical with respect to each other.
  • the upper half of each angled side portion includes a removable inspection cover plate 22 having an external exhaust hose fitting 24.
  • the lower half of each angled-side portion of the enclosure 12 includes an air intake port 26 covered by a box-shaped light baffle 28 closed on the bottom and both sides, but open on the top.
  • Detachable exhaust hoses 30 are coupled to the fittings 24 on the cover plate 22 and lead to a common exhaust duct 32 coupled to a conventional exhaust blower (not shown).
  • the partial vacuum created in the exhaust hoses 30 causes air to be drawn into the opposite sides of the enclosure 12 via the light baffles 28 and intake ports 26 and exhausted from the enclosure 12 through the fittings 24 in the cover plates 22.
  • each threelamp assembly 34 includes a specially designed integral mounting bracket 36 having an elongated base portion 38 with a perpendicularly depending flange 40 on one end fixed to the corresponding cover plate 22.
  • the other end of the elongated base portion 38 supports at right angles an apertured center plate 42 and two angled side plates 44 and 46 with similar apertures.
  • the light emitting ends of corresponding lamps 48, 50 and 52 are secured respectively in the apertures in the plates 42, 44 and 46 of the mounting bracket 36.
  • Lamps 48, 50 and 52 are preferably quartz halogen bulbs, which for their relatively-small size emit intense white light.
  • Heat absorbing glass plates 54, 56 and 58 are mounted directly over each corresponding aperture in the plates 42, 44 and 46 to stop the propagation of infrared energy.
  • Dichroic color filter plates 60, 62 and 64 are mounted directly on top of the heat absorbing plates 54, 56 and 58, respectively.
  • Each lamp and its corresponding heat absorbing and filter plates forms a single light source for a particular color.
  • the filter 60 for the center lamp 48 provides red light
  • the filters 62 and 64 for the side lamps 50 and 52 provide blue and green light, respectively.
  • each three-lamp assembly 34 is disposed in the air flow path between the corresponding inlet port 26 and exhaust fitting 24.
  • the two sets of three-lamp assemblies 34 on either side of the enclosure 12 are individually aimed, by means of the mounting brackets 36, at a removable light mixing chamber 66 held in place by clip holders 68 in the recessed bottom portion 14 of the enclosure 12.
  • the mixing chamber 66 has a house-like configuration including a peaked roof composed of two translucent diffusing panels 70 joined together preferably at a 90 angle at the top of the mixing chamber 66.
  • the roof panels 70 forming the light entrance to the mixing chamber 66 are preferably made of styrene plastic with a textured surface to enhance diffusion of incident light.
  • the inside surfaces of the upright sides 72 of the mixing chamber 66 have a reflective diffusing coating such as white paint.
  • a final diffusing plate 74 forms the light exit of the lamphouse assembly at the bottom of the mixing chamber 66.
  • the bottom of the enclosure 12 is formed with an aperture 76 to allow passage of diffused light out of the bottom of the lamphouse assembly 10.
  • the lamp assembly mounting brackets 36 are configured such that they determine the direction of the optical axes of the light emitted from the lamps 48, 50 and 52 via their respective filters.
  • the optical axes R for the lamps 48 providing red light preferably intersect the geometric centers of the respective roof panels 70 at right angles to the planes of the roof panels.
  • the axes B and G of the blue and green light, provided respectively by the lamps 50 and 52, are aimed by means of the mounting brackets 36 such that the axes R, B and G associated with each three-lamp assembly 34 lie in a plane orthogonal to the respective roof panel 70, intersecting the roof panel along a middle line m, approximately parallel with the intersection of the roof panels and halfway down the respective roof panel. All six axes from the two three-lamp assemblies 34 preferably coincide at a single point P within the mixing changer 66.
  • the light emanating from the final diffusing plate 74 is evenly distributed over a photographic negative 78 clamped in place by a negative holder 80 which forms part of a conventional photographic enlarger unit in which the standard lamphouse is replaced by the lamphouse assembly according to the invention.
  • the unique configuration of the house-shaped mixing chamber with translucent roof panels permits maximum utilization of the direct intensity of the three-lamp assemblies 34 while ensuring thorough integration of the incident colored light so as to provide a soft, well bleneded white light for projection through the photographic negative.
  • the increased intensity with thorough diffusion is accomplished with a configuration of marked simplicity and compactness in comparison to prior equipment of this nature.
  • One of the central features of this apparatus lies in the arrangement of the mounting brackets 36 in relation to the inspection cove'r plates 22.
  • the corresponding three-lamp assembly 34 is also removed intact because the mounting bracket 36 holding lamps is secured to the inside surface of the cover plate 22.
  • Replacing the cover plate 22 automatically aligns the lamps without further adjustment. That is, when the cover plate 22 is replaced on the enclosure 12, the mounting bracket 36 and thus the lamps 48, 50 and 52 automatically resume their correct positions within the enclosure. Accordingly, the cover plate 22 bears a predetermined geometrical relationship to the corresponding roof panel 70.
  • the cover plate 22 is parallel to the roof panel 70 with the base portions 38 of the mounting bracket 36 perpendicular to both the cover plate 22 and roof panel 70.
  • the configuration of the enclosure 12 forms an integral part of the functional relationship of the components of the lamphouse assembly.
  • Each control knob 18 on the front of the lamphouse assembly 10 is connected to vary the intensity of a corresponding pair of lamps providing the same color, enabling individual control of each sensitive layer of a color print paper.
  • the two red printing lights can be turned on and the brightness adjusted as needed and then turned off while the remaining pairs of green and blue lights are separately adjusted to the desired level.
  • the common power lead for the red, blue and green light circuits can then be connected to a conventional timing clock. With all three individual color control switches in the ON position, activating the timing clock begins the exposure with all three colors of light illuminating the negative at their proper intensities.
  • a lamphouse assembly for photographic printers and enlargers comprising first illuminating means for directing light energy in a plurality of different colors, second illuminating means for directing light energy in a plurality of different colors, a closed light mixing chamber having a roof-shaped upper portion formed by two translucent roof panels joined at an angle, a plurality of side portions each having a reflective diffusing interior surface and a bottom portion directly below said upper portion formed by a translucent diffusing plate, first mounting means for aiming said first illuminating means at one of said translucent roof panels and second mounting means for aiming said second illuminating means at the other translucent roof panel, whereby said colors of light are diffused through said translucent roof panels, blended by reflection and diffusion within said mixing chamber and further diffused through said bottom diffusing plate to provide evenly distributed, mixed light.
  • first and second illuminating means each include a plurality of individual light sources providing light energy having different primary colors within each illuminating means, said first and second mounting means each including a unitary mounting bracket for aligning the optical axis of each individual light source at a predetermined angle and point of incidence with respect to the corresponding roof panel.
  • first and second illuminating means each include three individual light sources respectively providing said primary colors, said first and second mounting means each positioning said three light sources side by side in an angled cluster such that the optical axis of the middle light source of each illuminating means intersects the correspending roof panel approximately orthogonally at the center thereof.
  • control module affixed to the outside of said housing having manually adjustable means for separately varying the intensity of corresponding pairs of said individual light sources and switch means for separately disconnecting said corresponding pairs of light sources from a source of electrical power.
  • each illuminating means are positioned such that the optical axes of all three light sources of each illuminating means define a plane approximately orthogonal to the plane of the corresponding roof panel and intersecting therewith in a line approximately parallel to the intersection of said roof panels and approximately bisecting said corresponding roof panel.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
US453109A 1974-03-20 1974-03-20 Lamphouse assembly for photographic printers and enlargers Expired - Lifetime US3897147A (en)

Priority Applications (2)

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US453109A US3897147A (en) 1974-03-20 1974-03-20 Lamphouse assembly for photographic printers and enlargers
JP3305975A JPS5419342B2 (enrdf_load_stackoverflow) 1974-03-20 1975-03-20

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048486A (en) * 1974-11-22 1977-09-13 Jenaer Glaswerk, Schott & Gen. Lighting device for fiber-optic systems
DE2724953A1 (de) * 1976-07-26 1978-02-02 Durst Uk Ltd Beleuchtungseinrichtung fuer ein fotografisches vergroesserungs- oder kopiergeraet
US4124292A (en) * 1977-10-06 1978-11-07 Henri Van Wandelen Light source for photographic color printers
EP0046732A1 (de) * 1980-08-25 1982-03-03 GRETAG Aktiengesellschaft Beleuchtungsvorrichtung für ein fotografisches Kopiergerät
US4372678A (en) * 1980-03-12 1983-02-08 Ciba-Geigy Ag Light-mixing system
US4493551A (en) * 1983-03-24 1985-01-15 Fine Richard A Illumination means for 3-D printing apparatus
US4814828A (en) * 1988-02-01 1989-03-21 Vivatech, Inc. Light source for photographic color printing
US4965624A (en) * 1988-06-24 1990-10-23 Arant Odas E Cold cathode light source for additive color enlarger
US5455655A (en) * 1994-04-22 1995-10-03 Hicks; Ray Lamphouse for use with photographic printer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0313300U (enrdf_load_stackoverflow) * 1989-06-26 1991-02-12

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480101A (en) * 1945-08-09 1949-08-30 Simmon Brothers Inc Illuminating system for photographic enlargers
US3011388A (en) * 1957-05-03 1961-12-05 Pacific Ind Inc Photochromatic analyzer
US3217594A (en) * 1963-02-27 1965-11-16 Simmon Brothers Inc Photographic printer and enlarger and light mixing device therefor
US3222985A (en) * 1963-01-29 1965-12-14 Remesat Armin Projection photographic color printing apparatus
US3227040A (en) * 1962-05-17 1966-01-04 William C Dauser Color head
US3272067A (en) * 1964-01-31 1966-09-13 Dennison Mfg Co Copying apparatus
US3345509A (en) * 1964-11-23 1967-10-03 William C Dauser Multi-color lamp
US3714875A (en) * 1969-07-16 1973-02-06 Spectral Data Corp Method of multispectral photography and protector
US3739700A (en) * 1970-06-24 1973-06-19 Spectral Data Corp Preregistered multispectral photographs

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480101A (en) * 1945-08-09 1949-08-30 Simmon Brothers Inc Illuminating system for photographic enlargers
US3011388A (en) * 1957-05-03 1961-12-05 Pacific Ind Inc Photochromatic analyzer
US3227040A (en) * 1962-05-17 1966-01-04 William C Dauser Color head
US3222985A (en) * 1963-01-29 1965-12-14 Remesat Armin Projection photographic color printing apparatus
US3217594A (en) * 1963-02-27 1965-11-16 Simmon Brothers Inc Photographic printer and enlarger and light mixing device therefor
US3272067A (en) * 1964-01-31 1966-09-13 Dennison Mfg Co Copying apparatus
US3345509A (en) * 1964-11-23 1967-10-03 William C Dauser Multi-color lamp
US3714875A (en) * 1969-07-16 1973-02-06 Spectral Data Corp Method of multispectral photography and protector
US3739700A (en) * 1970-06-24 1973-06-19 Spectral Data Corp Preregistered multispectral photographs

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048486A (en) * 1974-11-22 1977-09-13 Jenaer Glaswerk, Schott & Gen. Lighting device for fiber-optic systems
DE2724953A1 (de) * 1976-07-26 1978-02-02 Durst Uk Ltd Beleuchtungseinrichtung fuer ein fotografisches vergroesserungs- oder kopiergeraet
FR2360100A1 (fr) * 1976-07-26 1978-02-24 Durst Uk Ltd Systeme d'eclairement pour un appareil de reproduction photographique
US4124292A (en) * 1977-10-06 1978-11-07 Henri Van Wandelen Light source for photographic color printers
US4372678A (en) * 1980-03-12 1983-02-08 Ciba-Geigy Ag Light-mixing system
EP0046732A1 (de) * 1980-08-25 1982-03-03 GRETAG Aktiengesellschaft Beleuchtungsvorrichtung für ein fotografisches Kopiergerät
US4371258A (en) * 1980-08-25 1983-02-01 Gretag Aktiengesellschaft Illuminating device for photographic copying apparatus
US4493551A (en) * 1983-03-24 1985-01-15 Fine Richard A Illumination means for 3-D printing apparatus
US4814828A (en) * 1988-02-01 1989-03-21 Vivatech, Inc. Light source for photographic color printing
US4965624A (en) * 1988-06-24 1990-10-23 Arant Odas E Cold cathode light source for additive color enlarger
US5455655A (en) * 1994-04-22 1995-10-03 Hicks; Ray Lamphouse for use with photographic printer

Also Published As

Publication number Publication date
JPS5419342B2 (enrdf_load_stackoverflow) 1979-07-14
JPS517919A (enrdf_load_stackoverflow) 1976-01-22

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